package com.zjitc.interceptor;

import com.zjitc.domain.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LonginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取请求的URL
        String url = request.getRequestURI();
        // URL:除了登录请求外，其他的URL都进行拦截控制
        if (url.indexOf("/login.action") >= 0){
            return true;
        }
        // 获取 Session
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("USER_SESSION");
        // 判断Session中是否有用户数据，如果有，则返回true，继续向下执行
        if(user != null){
            return true;
        }

        // 不符合条件的给出提示信息，并转发到登录页面
        request.setAttribute("msg","您还没有登录，请先登录！");
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request,response);

        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
